Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2026-116779

freeswitch

Signalwire / freeswitch · affected before 1.11.3

Watch CVE-2026-116779 Browse KEV feed
Severity
CVSS 9.8 · Critical
Confidence
Confirmed
Exploit status
Trusted Third Party Report
EPSS
2.2%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-116779 is an unauthenticated vulnerability affecting Signalwire freeswitch.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Who is affected?

Signalwire / freeswitch affected before 1.11.3.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

freeswitch

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.3, sofia_presence_handle_sip_i_message() split the To user of an inbound SIP MESSAGE on a plus sign and treated the left side as a chat protocol selector. Selecting the api chat proto reached switch_api_execute(), allowing a peer whose MESSAGE was accepted to run FreeSWITCH API commands, including operating-system command sinks, with the daemon's privileges.

Inbound chat is enabled on the stock internal and external profiles, and any authenticated profile account is sufficient; stock directory users without password material can also remove that barrier in affected configurations. The flaw permits configuration and credential disclosure, arbitrary call control, and command execution, and exploitation has been observed in the wild. This issue is fixed in version 1.11.3.

signalwire Affected
freeswitch
Before 1.11.3
Published
05 Nov 2026
Exploitation Attempts Reported
09 Nov 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

CISA

Recorded 09 Nov 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2026-11-09 17:00 UTC
The Hacker News 2026-11-10 07:31 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

2.2%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Exposed Dangerous Method or Function CWE-749 Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE-77 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE-78

Recent mention · Security Affairs

U.S. CISA adds IBM, SignalWire FreeSwitch, OpenSSH, and GPUStack flaws to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds IBM, SignalWire FreeSwitch, OpenSSH, and GPUStack flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added IBM, SignalWire FreeSwitch, OpenSSH,...

Read full advisory

All Mentions

Recent mention · Security Affairs

U.S. CISA adds IBM, SignalWire FreeSwitch, OpenSSH, and GPUStack flaws to its Known Exploited Vulnerabilities catalog

Security Affairs · 10 Nov 2026

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds IBM, SignalWire FreeSwitch, OpenSSH, and GPUStack flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added IBM, SignalWire FreeSwitch, OpenSSH, and GPUStack vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog: Below are the flaws added to the catalog: The first issue added to the catalog, […]

Recent mention · The Hacker News

CISA Warns of Active Exploitation of OpenSSH, GPUStack, FreeSWITCH, and IBM Flaws

The Hacker News · 10 Nov 2026

Ravie LakshmananNov 10, 2026Vulnerability / Cyber Attack The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday added four security flaws impacting GPUStack, SignalWire FreeSwitch, OpenBSD OpenSSH, and IBM Aspera Faspex to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerabilities are listed below - CVE-2026-123218 (CVSS score: 9.8) - An incorrect authorization vulnerability in IBM Aspera Faspex that could allow an authenticated user to craft a specific message to bypass authorization, causing privilege escalations....

Timeline

From disclosure to observed exploitation attempts

  1. 07:31 UTC

    KEV confirmed by The Hacker News

    Exploitation attempts reported by an external source

  2. 17:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. 19:30 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 21:53 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-116779

Sample API response 
{
  "cve_id": "CVE-2026-116779",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.02177,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}